Means for securing the stators and rotors of electrical machines in adjustable relation.



No. 763,845. 7 PATENTED JUNE'28, 1904. H. BOHMLANDER 6: R. PFEIPER.MEANS FOR. SECURING THE STATORS AND ROTORS OF ELECTRICAL MACHINES INADJUSTABLE RELATION. APPLICATION FILED FEB. 24, 1902.

N0 MODEL.

Y WWJJM No- 763,845. PATENTED JUNE 28,1904.

H. BOHMLANDER & R. PFEIFBR. MEANS FOR .SBGURING THE STATUES AND ROTORSOF ELECTRICAL MACHINES IN ADJUSTABLE RELATION.

APPLIOATIQN FILED 11.13.24, 1902.

I0 MODEL. l 2 SHEETS-SHEET 2.

m; Q .JMN R I i i g UNITED STATES Patented Tune 28, 1904.

PATENT @rricie.

HANS BOIIMLANDER AND RUDOLF PFEIFER, OF CHARLOT"ICI'BURG, NEAR BERLIN,GERMANY.

MEANS FORSECURING THE STATORS AND ROTORS OF ELECTRICAL MACHINES INADJUSTABLE RELATION.

SPECIFICATION forming part of Letters Patent No. 763,845, dated June 28,1904.

Application filed February 24, 1902. Serial No. 95,331. No model.)

To (LZZ whmn it may concern:

Be it known that we, HANS BOHMLANDER, engineer, residing at 7Leibnirstrasse, and RU- DOLF PFEIFER, engineer, residing at 71Schliitcrstrasse, Charlottenburg, near Berlin, Germany, subjects of theGerman Emperor, have invented certain new and useful Improvements inMeans for Securing the Stators and Rotors of Electrical Machines inAdjustable Relation; and we do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to means for securing iron rings in the casingsof electrical machines and motors in such a manner that the said ringswhich constitute the active iron body of the machine are capable ofbeing adjusted to an accurately-concentric position relatively to therotor, this being eflfected by means of adjusting contrivancesinterposed at numerous points of the circumference between the innercircumference of the casing and the outer circumference of the ironrings.

We will describe the mode of carrying out the said invention withreference to the accompanying drawings, in which Figure 1 shows a partcross-section through the annular casing and the active annular body ofan electrical machine or motor arranged according to the said invention.Fig. 2 shows a front view of the entire casing on a smaller scale. Fig.3 shows a part front view of a somewhat modified arrangement. Figs. 4and 5 show, respectively, a front view and enlarged part crosssection ofanother modified construction.

In the construction shown at Figs. 1 to 3 the active iron body a isconnected to the easing or frame 5 by means of intermediate adjustableappliances csuch as screw-bolts, wedges, or combinations hereof and thelil:e arranged round the entire circumference of the said parts andoperating in such manner that, on the one hand, they are made to effectthe adjustment of the active iron body, so as to bring it into anaccurately-concentric position relatively to the rotor and after thusestablishing a uniform air-gap between the rotor and stator to firmlyfix the active iron body a to the frame or casing 71. For this purpose,as shown by way of example in the drawings, screwbolts 0, provided withtwo nuts (Z, and counter-nuts c are employed for securing the ring (1/to the framing 7), so that by a suitable adjustment of the said screwbolts and nuts all round the ring a any inequalities that may occur inits radial position can be readily corrected. By making the holesthrough which the screw-bolts 0 pass more or less enlarged or slotted,as shown, any inaccuracies that may occur in the relative axialpositions can also be corrected.

In the construction shown in Figs. 1 and 2 the intermediate appliances 0fulfil both the requisite functionsnamely, the securing of the ring (ato the casing .7), as also the production of a uniform air-gap betweenthe rotor and stator. These two functions can, however, be carried outby two separate appliances, as shown at Fig. 3, the fixing of the ring(6 to the casing 7) being effected by the intermediate devices f, whilethe concentric adjustment of (r, is effected by the devices 7.

In the arrangement shown at Figs. A and 5 the arrangement is such thatthe construction of the casing is .rendered independent of the width ofthe active iron ring, it being possible to shift the planes in which thefixing and adjusting devices operate relatively to the ring. For thispurpose the active iron ring a has dovetail grooves 12 formed in itsouter pe riphery, in which are fitted dovetail bars A, that are formedwith threaded holes, into which are screwed the fixing-screws v. Theforces exerted by the screws are thus transmitted through the bars tothe iron ring, and on account of the dovetail form of the grooves andbars the screws may either be made to exert a pressure or a tensionalforce upon the ring, or, in other words, a force may be exerted eitherin one direction or the other upon the ring.

Having now particularly described and ascertained the nature of our saidinvention and the manner in which the same is to be performed, wedeclare that what we claim is 1. In an electric machine, thecombination, with a supporting-frame, and a stator-core, of a series ofscrew-bolts arranged at intervals and securing the core to the frame,and other adjustable screw-bolts arranged intermediate thesecuring-bolts and serving to regulate the distance intervening betweenthe core and frame.

2. In an electric machine, the combination, with a supporting-frame, anda stator-core, of a series of screw-bolts arranged at intervals andsecuring the core to the frame, and other adjustable screw-boltsalternating with the securing-bolts and serving to regulate the distance intervening between the core and frame.

3. In an electrical machine, means for securing the stator-core inproper relation to the rotor consisting of a supporting-frame 1n fixedrelation to the rotor, a series of transverse dovetail grooves atintervals in the pe- 2O In testimony whereof we have aflixed our 5signatures in presence of two witnesses.

HANS BOHMLANDER. RUDOLF PFEIFER.

Witnesses:

WOLDEMAR HAUPT, HENRY HASPER.

